I have looked at teh rules and created one to auto assign new tickets to a user called 'unassigned'. I then created a Ticket view to view both unassigned and My tickets - this works, but shows all my tickets (open and closed) if i add a ststus of Open then I get All tickets or None as the rules don't allow enough combinations.

I have no unassigned tickets so the rule fails as not all the criteria are met. If I select 'Any' then i get all open tickets from my co-workers!!